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The companies will now jointly explore and potentially develop Westside's 50 per cent held ATP 688P permit in the state's northern Bowen Basin, which contains the Tilbrook, Mount Saint Martin and Bald Hill prospects.

Westside and Mitsui in March announced they would jointly acquire the Dawson CSG fields west of Gladstone.

The parties also said at the time that Mitsui would have the option, until October 31, to acquire 49 per cent of Westside's existing interests in the neighbouring Paranui prospect and its new Galilee Basin tenements.

"The inclusion of ATP 688P was a logical step to standardise our relationship across all of WestSide's operations," Westside chairman and chief executive Angus Karoll said in a statement on Tuesday.